Dahlia is grown for its root. Its summer flowers are a moderate draw for honeybees, native bees, and butterflies, even though the root is the prize.
Zones
Data not available
pH Range
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Sun
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Days to Maturity
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Score Dahlia on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether dahlia actually takes — and those shift from one yard to the next. Enter your address and we'll score dahlia against your land's real conditions.
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What Dahlia is
Dahlia reaches around four feet at maturity. It blooms in summer.
How to grow Dahlia
USDA Zones
Data not available
USDA PHZM 2023
Soil pH
Data pending
USDA PLANTS Database
Sun
Data pending
plant_species_v5.csv
Drainage
Data pending
plant_species_v5.csv
Mature Height
4 ft
plant_species_v5.csv
Sow directly
Sow dahlia seed straight into the bed — root crops germinate fast and resent transplanting. Give them full sun.
Match the soil
Pull a soil test from your local Extension lab to confirm pH and drainage match dahlia's needs before planting.
Water steadily
Keep the root zone evenly moist through establishment. Match watering to the plant's drainage preference and your local rainfall.
Harvest at maturity
Pull while roots are young and tender — sweeter than oversized ones. Local Cooperative Extension guides publish timing tables.
Good to know
Good news for pet owners — dahlia isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Dahlia offers moderate value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where Dahlia thrives
Whether dahlia thrives on a given site comes down to its soil pH, drainage, sun, and frost dates — the conditions that vary parcel to parcel.
See if Dahlia will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether dahlia actually takes — we score it against the real conditions at your address.
Three things about your exact spot that zone averages miss:
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Frequently Asked Questions
Can I grow Dahlia in my zone?
Zone data for dahlia is being finalized. A Growable Ground report checks your parcel's full suitability against federal soil, climate, and zone data.
When should you plant Dahlia?
Most growers plant dahlia after the last spring frost, once the soil has warmed. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
What soil does Dahlia need?
Specific pH data for dahlia is pending. A soil test from your local Extension lab confirms what your site needs.
Does Dahlia attract pollinators?
Yes — dahlia's flowers are a solid nectar source for honeybees, native bees, and butterflies (Xerces Society, Pollinator Partnership).
Is Dahlia safe for pets?
Dahlia is not known to be toxic to dogs or cats based on available data (ASPCA). Always supervise pets around new plantings.